/*
 * Original Author -> Harry Yang (taketoday@foxmail.com) https://taketoday.cn
 * Copyright © TODAY & 2017 - 2022 All Rights Reserved.
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see [http://www.gnu.org/licenses/]
 */

package cn.taketoday.web.multipart;

import java.beans.PropertyEditorSupport;
import java.io.IOException;

import cn.taketoday.lang.Nullable;

/**
 * Custom {@link java.beans.PropertyEditor} for converting
 * {@link MultipartFile MultipartFiles} to Strings.
 *
 * <p>Allows one to specify the charset to use.
 *
 * @author Juergen Hoeller
 * @author <a href="https://github.com/TAKETODAY">Harry Yang</a>
 * @since 4.0 2022/3/2 16:37
 */
public class StringMultipartFileEditor extends PropertyEditorSupport {

  @Nullable
  private final String charsetName;

  /**
   * Create a new {@link StringMultipartFileEditor}, using the default charset.
   */
  public StringMultipartFileEditor() {
    this.charsetName = null;
  }

  /**
   * Create a new {@link StringMultipartFileEditor}, using the given charset.
   *
   * @param charsetName valid charset name
   * @see java.lang.String#String(byte[], String)
   */
  public StringMultipartFileEditor(String charsetName) {
    this.charsetName = charsetName;
  }

  @Override
  public void setAsText(String text) {
    setValue(text);
  }

  @Override
  public void setValue(Object value) {
    if (value instanceof MultipartFile multipartFile) {
      try {
        super.setValue(this.charsetName != null
                       ? new String(multipartFile.getBytes(), this.charsetName)
                       : new String(multipartFile.getBytes()));
      }
      catch (IOException ex) {
        throw new IllegalArgumentException("Cannot read contents of multipart file", ex);
      }
    }
    else {
      super.setValue(value);
    }
  }

}

